Gymnastic exercises are a really really really great way to teach horses to jump for themselves. The rider goes into two point for the whole gymnastic exercise, sitting quietly and learning to balance while the horse finds the spots and adjusts his own stride.
Using these types of exercises will encourage your horse to relax (he'll have to or he'll crash through) and slow down on his own, naturally. A few important keys are to trot in and canter out, and build the gymnastic one obstacle at a time. Wait until he's comfortable before adding another element. It's a lot easier if you have someone who can help you from the ground and serve as your jump crew.
If you need an explanation of gymnastic exercises, how to set them up, or ideas for a variety of set-ups, go check out http://regardinghorses.com/2007/11/2...tic-exercises/
. The explanation is too long to post here. Hope that helps!